And who is going to make up this comprehensive list of categories? It appears you expect someone else to produce this list for you.

Though I doubt the comprehensive list of categories will be needed any time soon, as what you propose sounds like quite a major change to be of much use. Just adding a "categorization" is pretty useless unless you also add ways to use categorizations, correct them, etc. Which, IMHO, requires a lot more design work than "let's add a drop-down list when approving".

Well, since you're the second person to read my post as such, I feel a need to clarify. When I suggested the gods put up the initial list, it's out of my respect, not out of my laziness. One could copy the section titles from the cookbook and start with that, eventually one would need some infrastructure to allow adding/deleting/editing these categories.